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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56872a6d17401b2d81c8e9724cb6eb95a4f30016254494669108afa7a67bb0b5' 
  AND token = 'GaSCRNKRiJ6qczEsluSbRttWPndCbVrXlu+1trraMiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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