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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad42fe10caa325bc7a24f3ba5f0798231799eb8831bd973dce326dd9e448a32a' 
  AND token = 'bD4jQWnGaRp7cod0JjRcFId5699X4sYcyJ97puRiRJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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