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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa100daa9cd9a9838ed6974c005d376f897e5b0c5c14e3ca96fa852701ec7bcb' 
  AND token = '2csHER04iw5O9IJ3U70eDoPB+M9FbSqFDSCFHlxtvTE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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