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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68136103d0c5b8cd37cbb904ef3c281f45a08226340158dc7f2f3dfde05c2864' 
  AND token = 'tAC/NaGE33qJEwY/7E/fLQnvR6sYonGIQKQkK0xmP30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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