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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47668a8145fcbc594e1ff00b72e5e026e1de8422d4ec8700e0dabadd15d62044' 
  AND token = 'jSXE57UhlhEBUBNEZqEeyhK6cbDANJ3qsnaHDgfy+lE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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