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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba237c76c2daf2ef645b5fa5e95e5e69dcf8d308f838f4346d9dee70907a2ae' 
  AND token = '4pyBKzOK+npx6FURsNLzZ8o3rHgIyK8HchOSAquA+Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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