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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd41d206e8f8f9a34b5d409c0d5319ddbcb98a80101fb3c763438bc48a063703' 
  AND token = 't9iBEmZ5CSp3Irh0RTcELWZI5M9vQHNC28eqGDuRsKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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