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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06614d652e1d90d5d7c68945741c38da69c56e511791486e7f76a3b7c7328c6' 
  AND token = '1KZhtkA82NcxypJCIeuUb4UJM+QA6/R9eWbjqI1WV7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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