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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eac7b34d26f92ace5a4d5102b6c62af288dd6cb4e4b96098f2b93a2ecb7e0c13' 
  AND token = 'YYInJHeOnqQzr6IPohMwd06mhPaXLTgp9mRmr07WTAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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