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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d537fa92dd0cc21e8b410824cc555ab4910a76e00a1b39c8d81102301410cf8' 
  AND token = 'l4Vv4xSQyunzuh2rVzqoa3kJ15Zx6PHmaxtnpsNk/3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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