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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ccc098b7c5b18ddcdc00c6b45ceac384e35304af5fdcfcac60239316c9c0fd1' 
  AND token = 'OmcIpbsEA8DluriAYZh04ge6AD597yOsmjenFRrwuE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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