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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c348f9adcfcefcc832e41b0402096180a1a9d1366df920c840ae135811c1ffd9' 
  AND token = 'dii1Km/wnSDY0cwNq5VnHJmLlkSlxs3BHnKhocjFp8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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