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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1272998dc04fc2a98e6ce29997623f513dd46c83830747495da11e2ae5495e55' 
  AND token = 'pqcdo7TCWb2vvNfRfFx/pgLoN2wRG25QH5n62rEzxmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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