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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59dd9696122d4d4e72a55785f105d8e07bb67d9cb25a191644f251de4cc3be9e' 
  AND token = 'L0MJiuC9uYZNLNIae8cIXGbcRLWKKM94T0yX7e3HJjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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