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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28342bb0a0392da6deb267a7ccdecfb569a8e1a06f0fdaf00db9a3cbbe115805' 
  AND token = 'XbSZkMA+ep6HQ9tIB2+c3eP4m0vhdoK+GOr9VoDIbZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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