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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6daec9095ce3430fb444328ba3acc7a60626996888293d214f6ef3d83e10097' 
  AND token = 'Ruqa9zwOrK082s6wUgyDMix0vFqcrq9Guz1NhIhflSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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