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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389b2857b088e058b5240c49828989df93a7952f5e69b78fc14e12c1090c04ee' 
  AND token = 'HDcQv0krLhUxWa6kJg1cad+vK+nXesfe5j7YMt+ucJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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