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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83adee31ad5a4feb6da106e7e119d1873b45e8ee1da9de1ffca6ed0e8c7f14ca' 
  AND token = 'XdDcp3e7aG36EYlLAYF+p7to1DVxep4UEs25J4RznQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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