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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16b3e4c6f1d0a640d44450e59178cbda86a5ded824316ed699b94dfbd3515ee0' 
  AND token = 'PBXk1cChWQt+uU8uCh+KwrdcfBai2/ErZxuuzAY2sZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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