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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c9c08bbe1c130bf71d4454f8131b997ce2f189cdcc577b34dd2fe2f374ecd3' 
  AND token = 'hTa9fW9r2yW+XMW3oMZyyL8ni7nllUhwGjqlFur9gcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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