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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afa6880324f8e53ea8223b05a23f64e1f2573c45f1f69a2adc747a25e43b6c2' 
  AND token = 'uWIukmfGw2WlvItExEs7r4iyYVEQHW8klc1KPjKqcSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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