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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd132c7ef649bac564ca4687667cd0cd22566ec7872c3d9727cdbdb1a6c63061' 
  AND token = '1HWVWwck7NMUNHOOFabueuCxOkZvDlNLtl/bxhXKK+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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