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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f42f62efe5728bfcb2e5015ba08104b1b787f452e81a63ac5ea5c7953d090c5' 
  AND token = 'sPgQlDuW4dO4dVGX/TerwcMtRhiu7dBPkrZuClaAuT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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