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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dff4c433ceb6b37c634fcd6f08b55dcff8b1e46259e55ce40ccd88c21764d73' 
  AND token = 'Xd9iiFKnY9kqpmffIQghYp4bW4unAZ3074Z0uIUil8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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