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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f45fab9c662058134b10cf8429581b34c8e41fa85cb60501b575f7f039b3590' 
  AND token = 'dL9twLbTjw8NlGjktX7OAEiEtXzrCKgyD2dHIBuz+pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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