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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3362af600189cf2120620328bde8c8bc48aacffa0d3d18424e949ce60922982d' 
  AND token = '9D53s3rR/CpGNfwYpYfz8JyIsQVZccMvMCMB4vy2WCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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