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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7055776b41462e90e9babf2aed300acabaccdf06a53c4ed7ce58c468b3da1b44' 
  AND token = 's8VLplQncLWdpiyEmUj2Sv2A968oWzogS5rV5Nxiadk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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