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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd0738cc7c7a5b3472f8fa41d2b09b7ba2ce61e513c26c2d273c0536bf6c19f6' 
  AND token = 'BYZ5XyLjTiIuScZWNzm2VyDPYjq51DsjS8EvT8MypAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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