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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563e92e8c176d287d457330feb6ad8a36861a6b03717e1a80a833dc8063f396f' 
  AND token = 'orI5k2qoaRTg6keKuUA2Xm6dPodml5yk/5kweKkEWak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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