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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51865367ff2df58f68063e95a2999af038ea2bb1ccd7877b835d5c3b02e59033' 
  AND token = 'BJON9V03h4Qvsf56Z6nXMSrrk5SHP8FyUfrw4EUDnd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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