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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5ba673357595090959929fd463db9f960650492b9b41a7c7c7a7704961f800' 
  AND token = 'L8LW/o1s7DTf2WjsN5BSqeA/8gdvJ15GCi3GLRNkOa4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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