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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90a5874b8c412f2fe55cc8cbd9bc7c8f2ff3e98a2d6b98ae6840a7bb156738b5' 
  AND token = 'ANyKCvatR5B2Kro3fRhh2TWTU20xrw0kv9/CtpiStHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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