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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14497976b99079720caa8fedb3b3d08855c35eed1578b194bc56abfc998a9d71' 
  AND token = 'XQZs+cBchXjrHSiY031ej/ouWIfZ3u2IS+Omsd0PMOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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