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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9b49b8e2eb4eba08d2fce0b54c6d811deea1d7a4abfd447b43f9b9e167c95d' 
  AND token = 'ca2nSkPH/vHM0DXr2Kp0Z86muN4fh59ccmK/e51t+IQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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