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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e8b747c19c104343244c47f0375a9e66e383c57447089da8fdb80ce560ce8c8' 
  AND token = 'J1nJeOEvvpd8XTDmYPwgkJNgWH0IzreNG0YZ+3+h61A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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