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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a67f0543237fb0dc89a34a447d7164676e430ed2d540c4f9bb35c34877c123' 
  AND token = 'cV5OZneAc5XN4/7Pc4eE13FQGR0WWTsf3vEt8b/uvvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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