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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e97b355640fd60d87fc819bd4e053cc75d7c55ea7b50b5af4152355cdb3817' 
  AND token = 'pEN8bRWZcrL1r2ehJG9IdJw9Jc5X0v3gx7Z4XsrsMtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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