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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaa3c376e5661bf71cdb73ee6689e13087d91367441e34670e4fe4009f6c7bd2' 
  AND token = 'eRtgNdZb9qM46cbK94b5Zc1mbIYuqmj96P/1BxvTknE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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