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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c219be0ea389aae0ef6a707c3838577f64ec18660ed31f4034b0d02612b64df2' 
  AND token = 'oGghYmpIhSj7fWUiZCuTLwdtZhKs93GbMn62KwEKlo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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