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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd084e3dc20c9b39e4ef2fb6c101961b1b38254856b417cbb87675fba17ef4d86' 
  AND token = 'KmPEoooujpVq+2pCjOcXcC0QKbEa1LwW+ioRgwqffIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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