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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9b0f59225e2aaf07c05dcc68e95e93b9f827dc4d60602cb2101bc7a138c1090' 
  AND token = 'lnY4xAERg5/PkKeHxnbsdLm4WUfy1iMVz8zDz+41d38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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