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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a493da8ac15f47e5286e2c4c8e88226bfbf6327b881dba062ba051c4d1b47926' 
  AND token = 'J5YIH8ioYtH2VnMop3ncGjK2Fgc4H8ShXXClK3pKGNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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