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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d2866b2e259e5edeec953dce02728b20890283f3dc9b3cffccd6bd85b3dae68' 
  AND token = 'EZb99NS5doj5tlPLxgSpHExrilXngIB9fDuDOB9Ed8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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