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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58b6771d09bdaee20812e31458a6d0c5568e28da4136142d1987ced20208c4c5' 
  AND token = 'AVSWf9osbQMWgP7VxCTQW1Ae1jIbCMvXeK2bxQWYmDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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