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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e762bdba01fcea3af80867a4d2dfe035221c51ec241c5cda415b859a1c91545d' 
  AND token = 'ZK4l011cpHcBJCyer5LGLf0YgLi0QwInYgIvbENaecU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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