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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6366ebe6da84d794d98a562170246304a35ff04bf7674804290a90bb6b61b1d3' 
  AND token = '3TCO8lI9IIVNXlWGG17uPXssrOHbUbFFCyAqg6/5R58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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