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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '535521086a7b74ff1e9e748edf869c1de5e7dd74da8d9f1dff54a5545d7f953f' 
  AND token = '9BiXyNnx3/M9SLPX2BCnv/EAEYj+4QdeOhwbkHD1o80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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