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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce69ceebbd1ce086d01cb0a634eb2596af8a791e7d27cde46ee5ff1555dbeb7' 
  AND token = 'kfSId7gxu7IZR+bIWDFxJYIYlixgl5bm5hlIYCWkH9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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