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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c727e31b3c6e3a4d9f3b4927afa4bbfa91a1ff5cc4ca74a2bf41406273df31' 
  AND token = 'xBLzAFWqj/5gOpAmuz20gW2qObpULtAXZMTUDI3AMDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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