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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fee3a873f009851ce517ea76b1dcb3416dfa118b407be35983ef4a59f75fb4' 
  AND token = '9ILVWCj+r9KZE+W7iF8JoLhnr7v91O4zPFs9k14bSqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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