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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409929014958ecfe5da8b57bdba13c49929a5721b6f906506f8c163829b0c7b9' 
  AND token = 'MGdRJw9urWAcu77OgW1y1iR6jspBaBNeLfuDaZnbOvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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