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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8831c61bc2d0505a593f29136e593c2a8115125996e14823522cd885d24c0d' 
  AND token = 'qf8mTJ/5+Vk0uWZwKEiJjg0ZTWfoHAmLTK2dXlR+BQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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