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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd339b9792317be3fc4d2bfbe8b7b2a897597daec8ae9edfbfff47ec21ec6fabf' 
  AND token = 'GTD6J83kEsc3E4QmXVFSUd9WVjJPcbeQq9RNPA1sZ1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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