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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '725d5ff92367c1fb24bd7800cadf889b2bffedef3fd10850c64ce6ecb349128c' 
  AND token = '/njIRSXP6IKp3bfNODiCHGW+SA9c2TDbfHESasNR7Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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