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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '809e0018a97015fa8aee0c7f8c27ff4e38357864f9487916cef9c6c1ee761f5f' 
  AND token = 'hcx4DIM+Geeb89/vakU/kMV7osEp8m8IyIAHfwuDYCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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