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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ec554a71b4fb0018815d5fe8ee8983d5f055bed7bf78507af3e280555629ea' 
  AND token = 'ysWQIMJXBgD8Nojy8emJ71jqtvFZc3PWfwFzDSSNbU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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