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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6e1a37f4a1b5fdefca26e9aaf6864c848f141995717225356f72492baaae47a' 
  AND token = 'wRYZGIZ2zCVibEBcd/c2kUAKCuzfJyeJX4341iQJkXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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