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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65c6cf91a83d88834939c5aa72281ac498389429bc780e308a9727d24a3c62f7' 
  AND token = 'i9vEws8kE23vMUxH1oyVVi6q8vZYRWnFSszm0kq0mO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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