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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822824822f639594466e7634369768de02876fdb80f7f96f5a2477b56d734dc5' 
  AND token = 'RZ0eXNF8SrgffD5oIIvyb7mQq9HaZJbqk189G+Lkp5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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