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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75cfb0f6102b42d74f5080513bb954d24f538f960d8da2bf329b2f99a927b661' 
  AND token = 'm3GShAdkv4bK89pPG5WT2mtJmht0cBlRAZJGOTIDLyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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