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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e34a87bb7f77118d659b8d5f1a8fc2a999b6465e562f0b77be172b99e5de51' 
  AND token = 'uyF11pulT5hZhFlZzt8FmzPgERJLtn3MlBdy8DTt5Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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