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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd3242baa98ca55e95c1fdcf7d4b27384dd070f4e1252e4462660e3762e83f7' 
  AND token = 'QS6CT7oDs5eHyAqPw/eyFNdFV6WnFEkoLzfWHHgDN/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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