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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdffde148332e5a4d7282c5a55f04f4f64809f58c04d892a03349ad8e8ebf99c' 
  AND token = 'rAWJQMVdcarAJmEwmhDcqazMRZfco1eJEYhDNXguEEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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