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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8631ce4d28e44b2dce591c53b4dcd217018e6dd7f056fba634ef227936d348ce' 
  AND token = 'Y7LW+wREjw699SMxr8TaMKl+/cdCR/CHutardVA3IbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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