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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bd1956d57637d3c55e28cdcaa9454ac72281238fb28a4f2516eab50fe40425' 
  AND token = '6lFFUuaK007crBZ28H5IOB3gFic+4aaH5ANGrl2uQwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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