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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6777143f8258a82d7f73d672c3eee5cb7eabafab646cf6b95d964cb75bddb977' 
  AND token = 'ZWkYdAGJEdd1vftPRzQ+jUI2qFcqSqpj7T5/CcsosoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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