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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202ae5b3e1193f64e8d7ecb434e2e73fa66188dccb50b3bcca4a69549531f2ff' 
  AND token = 'A2yYgdZLviC8v8r9WA2qYN0ubzsmam1CQhx6iAP0BSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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