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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1d724442e8f88332549525f3561d07be1a1f8bb4a08c689a8dd36675dbdb9b0' 
  AND token = 'Kr9XGPQ2ldnLUNg02iF+ProDknF1OYnjysVrbUJqOI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}